Wow....chlorine bleach on a mic??Bleach is a very strong oxidizer and very corrosive to metals...even stainless steel...yikes!
About 10 years ago...when I was financially destitute,I had to resort to buying a Radioshack brand Casio keyboard(fantastic for what it was though)...so in the interest of improving it's appearance,I wanted to remove a pesky decal/price tag sticker from it.
In doing so though,it left behind some residual adhesive,so I used a multi-surface cleaner(something along the lines of Windex) and although this was much less caustic than bleach,it was still strong enough to discolor the plastic chassis.
Since then,I have followed the maintenance warnings on all of my equipment to the letter & have been very diligent about it.